batgrbproduct Analysis for Trigger=455904
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Tue Jul 5 10:12:47 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger455904/batgroup_hand_proc
======================================================================
Trigger: 00455904 Segment: 000
BAT Trigger Time: 330532909.812 [s; MET]
Trigger Stop: 330532909.844 [s; MET]
UTC: 2011-06-23T14:41:42.726200 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.316536827048 Dec: -4.93719335603939 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 13.67
Image Trigger?: NO
Rate S/N Ratio: 102.186104730536 [ if not an image trigger ]
Image S/N Ratio: 13.67
Flight Position: [ source = BAT ]
RA: 280.316536827048 Dec: -4.93719335603939 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.32663448628 Dec: -4.94109856404019 [deg; J2000]
{ 18h 41m 18.4s , -04d 56' 28.0" }
+/- 1.52912061566178 [arcmin] (estimated 90% radius based on SNR)
+/- 0.632816782839611 [arcmin] (formal 1-sigma fit error)
SNR: 16.5817428172014
Angular difference between Flight and Ground position is 0.647493 arcmin
Partial Coding Fraction: 0.1855469 [ including projection effects ]
Duration
T90: 0.0199999809265137 +/- 0.00894426338023564
Measured from: 0
to: 0.0199999809265137 [s; relative to TRIGTIME]
T50: 0.0119999647140503 +/- 0.004
Measured from: 0.00400000810623169
to: 0.015999972820282 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.486000001430511
to: 0.513999998569489 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0240000486373901 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.135082 0.135671 0.037572 -0.001407
0.011848 0.012067 0.006624 0.002373 [error]
Peak 0.176246 0.153967 0.055989 0.005190
0.018752 0.018403 0.014559 0.011400 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 4.88e-08 3.92e-08 2.12e-08 1.68e-08 1.17e-07 1.26e-07 erg/cm2
Error 6.34e-09 4.65e-09 4.14e-09 5.67e-09 1.36e-08 1.58e-08 erg/cm2
Peak flux Power-law 1.96e+00 1.13e+00 4.16e-01 2.02e-01 3.62e+00 3.71e+00 ph/cm2/s
Error 3.36e-01 1.59e-01 1.07e-01 9.35e-02 4.85e-01 4.97e-01 ph/cm2/s
Fluence Cutoff-PL 4.37e-08 6.12e-08 2.01e-08 8.09e-10 1.26e-07 1.26e-07 erg/cm2
Error 7.22e-09 8.59e-09 5.58e-09 1.09e-09 1.36e-08 1.36e-08 erg/cm2
Peak flux Cutoff-PL 1.83e+00 1.30e+00 3.71e-01 4.13e-02 3.54e+00 3.54e+00 ph/cm2/s
Error 3.77e-01 2.30e-01 1.42e-01 1.10e-01 4.93e-01 4.99e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.883 0.177 - - 4.26e-01 6.55e-02 66.830 57
CPL -0.214 1.125 28.0 5.0 3.40e+01 9.42e+01 37.000 56
The chi2 of BB fit is 40.81 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.447 0.262 - - 1.90e-02 3.77e-03 60.170 57
CPL 1.251 1.197 23.2 0.0 1.06e-01 0.00e+00 57.610 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.024 0.000 0.024
T90 0.020 0.000 0.020
T50 0.012 0.004 0.016
Peak 1.000 -0.486 0.514
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.3266 -4.9411 0.0116 35.6880 117.2420 0.3294945 16.582 TRIG_00455904
Foreground time interval of the image:
0.000 0.024 (delta_t = 0.024 [sec])
Background time interval of the image:
-239.812 0.000 (delta_t = 239.812 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.88305 ( -0.169442 0.184746 )
Norm@50keV : 0.426071 ( -0.0660715 0.0650251 )
------------------------------------------------------------
# Chi-Squared = 66.83 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.750289e-01
Photon flux (15-150 keV) in 0.024 sec: 107.763 ( -12.3 12.3043 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16713e-07 ( -1.36285e-08 1.36503e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.213684 ( -1.2135 1.03731 )
Epeak [keV] : 27.9678 ( -5.99351 3.9565 )
Norm@50keV : 34.0470 ( -34.047 154.39 )
------------------------------------------------------------
# Chi-Squared = 37.00 using 59 PHA bins.
# Reduced chi-squared = 0.6607 for 56 degrees of freedom
# Null hypothesis probability = 9.765200e-01
Photon flux (15-150 keV) in 0.024 sec: 113.976 ( -12.571 12.573 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25729e-07 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.214392 ( -0.914598 1.4215 )
beta : -9.99983 ( 19042.2 19052.2 )
Epeak [keV] : 27.9613 ( -5.99135 3.9553 )
Norm@50keV : 34.0967 ( -34.0971 155.049 )
------------------------------------------------------------
# Chi-Squared = 37.00 using 59 PHA bins.
# Reduced chi-squared = 0.6727 for 55 degrees of freedom
# Null hypothesis probability = 9.702661e-01
Photon flux (15-150 keV) in 0.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.96838 (-0.711508 0.697611)
R^2/D10^2 : 140.201 (-43.2819 67.6577)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 40.81 using 59 PHA bins.
# Reduced chi-squared = 0.7159 for 57 degrees of freedom
# Null hypothesis probability = 9.479951e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.852e-08 6.264e-09
25- 50 6.696e-08 8.172e-09
50-150 1.735e-08 4.966e-09
15-150 1.228e-07 1.486e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.3119 (-3.63484 4.10845)
Norm : 1071.78 (-188.031 222.593)
------------------------------------------------------------
# Chi-Squared = 43.57 using 59 PHA bins.
# Reduced chi-squared = 0.7643 for 57 degrees of freedom
# Null hypothesis probability = 9.048330e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.865e-08 6.312e-09
25- 50 5.149e-08 6.324e-09
50-150 2.357e-08 6.326e-09
15-150 1.237e-07 1.535e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.85619 (-2.85645 12.0539)
R1^2/D10^2 : 982.302 (-875.848 866577)
kT2 [keV] : 8.97850 (-1.16927 6.92741)
R2^2/D10^2 : 69.3842 (-68.4385 76.8961)
------------------------------------------------------------
# Chi-Squared = 36.52 using 59 PHA bins.
# Reduced chi-squared = 0.6640 for 55 degrees of freedom
# Null hypothesis probability = 9.740948e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.401e-08 2.308e-08
25- 50 6.109e-08 3.392e-08
50-150 2.099e-08 1.200e-08
15-150 1.261e-07 6.536e-08
Peak spectrum fit
Power-law model
Time interval is from -0.486 sec. to 0.514 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44720 ( -0.247438 0.276197 )
Norm@50keV : 1.90136E-02 ( -0.00382332 0.00372441 )
------------------------------------------------------------
# Chi-Squared = 60.17 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.616954e-01
Photon flux (15-150 keV) in 1 sec: 3.61762 ( -0.485122 0.485218 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87559e-07 ( -2.92037e-08 2.97817e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.486 sec. to 0.514 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25064 ( -1.63674 0.757293 )
Epeak [keV] : 23.2226 ( )
Norm@50keV : 0.105668 ( )
------------------------------------------------------------
# Chi-Squared = 57.61 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 56 degrees of freedom
# Null hypothesis probability = 4.153107e-01
Photon flux (15-150 keV) in 1 sec: 3.53775 ( -0.49191 0.49342 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73024e-07 ( -2.9061e-08 3.3148e-08 ) ergs/cm2
Band function
Time interval is from -0.486 sec. to 0.514 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19595 ( -0.936985 1.20326 )
beta : -3.67032 ( 3.65127 1.27776 )
Epeak [keV] : 23.7093 ( -12.3086 8.23914 )
Norm@50keV : 0.114588 ( -0.0363196 5956.51 )
------------------------------------------------------------
# Chi-Squared = 57.35 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 55 degrees of freedom
# Null hypothesis probability = 3.880320e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.04612 (-1.13058 1.24488)
R^2/D10^2 : 3.92915 (-1.76089 3.3897)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 64.75 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.243890e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.619e-08 1.195e-08
25- 50 8.166e-08 1.673e-08
50-150 2.185e-08 8.110e-09
15-150 1.497e-07 2.785e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.0994 (-9.18751 13.6559)
Norm : 25.9578 (-6.17322 8.44895)
------------------------------------------------------------
# Chi-Squared = 57.63 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.517132e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.678e-08 9.825e-09
25- 50 7.036e-08 1.127e-08
50-150 4.689e-08 1.960e-08
15-150 1.740e-07 3.405e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.49744 (-1.57546 2.2462)
R1^2/D10^2 : 72.1873 (-62.0028 2241.43)
kT2 [keV] : 10.5073 (-2.14105 4.62804)
R2^2/D10^2 : 1.04594 (-0.883539 1.96116)
------------------------------------------------------------
# Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.088413e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.682e-08 3.006e-08
25- 50 7.152e-08 3.799e-08
50-150 3.825e-08 2.295e-08
15-150 1.666e-07 8.540e-08
Plot creation:
Tue Jul 5 10:42:22 EDT 2011